package com.lxz.jucdemo.list;

import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.FutureTask;

public class CallableTest {
    public static void main(String[] args) throws ExecutionException, InterruptedException {
        MyThread thread = new MyThread();
        FutureTask futureTask = new FutureTask(thread); // 适配类
        new Thread(futureTask, "A").start();
        new Thread(futureTask, "B").start(); // 结果会被缓存，效率高
        Integer o = (Integer) futureTask.get(); //这个get 方法可能会产生阻塞！把他放到最后
        // 或者使用异步通信来处理！
        System.out.println(o);
    }
}

class MyThread implements Callable<Integer> {
    @Override
    public Integer call() {
        System.out.println("call()"); // 会打印几个call
        // 耗时的操作
        return 1024;
    }
  //细节：
  //1、有缓存
  //2、结果可能需要等待，会阻塞！

}
